CUT USING TIN SNIPS
PRESS OUT BY HAND
CUT FOUR CORNERS
AFTER REMOVING SHEET
METAL
SCRIBE LINES OUTLINING
DUCT FLANGES
Duct Flange Cut Outs
When the furnace is used in connection with a cooling unit, the furnace should be installed in parallel with or on the upstream side of the cooling unit to avoid condensation in the heating element. With a parallel flow arrangement, the dampers or other means used to control the flow of air must be adequate to prevent chilled air from entering the furnace and, if manually operated, must be equipped with means to prevent operation of either unit unless the damper is in the full heat or cool position.
When the furnace is installed without a cooling coil, it is recom- mended that a removable access panel be provided in the outlet air duct. This opening shall be accessible when the furnace is installed and shall be of such a size that the heat exchanger can be viewed for visual light inspection or such that a sampling probe can be inserted into the airstream. The access panel must be made to prevent air leaks when the furnace is in operation.
When the furnace is heating, the temperature of the return air enter- ing the furnace must be between 55°F and 100°F.
FILTERS - READ THIS SECTION BEFORE INSTALLING THE RETURN AIR DUCTWORK
Filters must be used with this furnace. Discuss filter maintenance with the building owner. Filters do not ship with this furnace, but must be provided by the installer. Filters must comply with UL900 or CAN/ULCS111 standards. If the furnace is installed without fil- ters, the warranty will be voided.
On upflow units, guide dimples locate the side return cutout locations. Use a straight edge to scribe lines connecting the dimples. Cut out the opening on these lines. NOTE: An undersized opening will cause reduced airflow.
Refer to Minimum Filter Area tables to determine filter area require- ments.
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| UPFLOW |
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| COOLING AIRFLOW REQUIREMENT (CFM) | ||||||||||||
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| 600 |
| 800 |
| 1000 |
| 1200 |
| 1400 |
| 1600 |
| 2000 |
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AirflowInput | 0453__XA | 376* |
| 384 |
| 480 |
| 576 |
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0704__XA |
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| 627* |
| 627* |
| 672 |
| 768 |
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| 0905__XA |
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| 836* |
| 836* |
| 836* |
| 960 | |||
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| 1155__XA |
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| 940* |
| 940* |
| 940* |
| 960 | |||
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| COUNTERFLOW |
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| COOLING AIRFLOW REQUIREMENT (CFM) | |||||||||||
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| 600 |
| 800 |
| 1000 |
| 1200 |
| 1400 |
| 1600 |
| 2000 |
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Input Airflow | 0704__XA |
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| 320* |
| 320* |
| 336 |
| 384 |
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0905__XA |
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| 427* |
| 427* |
| 427* |
| 480 | ||||
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*Minimum filter area dictated by heating airflow requirement.
Permanent Minimum Filter Area (sq. in)
[Based on a 600 ft/min filter face velocity]
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| UPFLOW |
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| COOLING AIRFLOW REQUIREMENT (CFM) | ||||||||
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| 600 | 800 | 1000 |
| 1200 |
| 1400 | 1600 | 2000 |
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AirflowInput | 0453__XA | 376* | 384 | 480 |
| 576 |
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0704__XA | 564* |
| 564* |
| 672 | 768 |
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| 0905__XA |
| 752* |
| 752* | 768 | 960 | |||
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| 1155__XA |
| 940* |
| 940* | 940* | 960 | |||
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| COUNTERFLOW |
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| COOLING AIRFLOW REQUIREMENT (CFM) | ||||||
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| 600 |
| 800 | 1000 | 1200 | 1400 | 1600 | 2000 | |
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Input Airflow | 0905__XA |
| 854* | 854* | 854* | 960 | ||||
| 0704__XA |
| 641* | 641* | 672 | 768 | ||||
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*Minimum filter area dictated by heating airflow requirement.
Disposable Minimum Filter area (sq. in) [Based on 300 ft/min filter face velocity]
UPRIGHT INSTALLATIONS
Depending on the installation and/or customer preference, differ- ing filter arrangements can be applied. Filters can be installed in the central return register or a side panel external filter rack kit (upflows). As an alternative a media air filter or electronic air cleaner can be used as the requested filter.
The following figure shows possible filter locations.
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